Jet Tools J-7040 - Manual (Page 14)

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Figure 13: Blade-to-bearing orientation
4. Position the bearing by turning the bushing.
Set the clearance at approximately 0.001 inch.
(The blade should be in a vertical position
between the bearings. (See Figure 13.)
5. Tighten the center locking screw with an Allen
wrench while holding the eccentric bushing in
position with the 3/4-inch wrench.
6. Use the same procedure to adjust the other
guide bearing.
7. When the adjustment is correct, the guide
bearings should rotate freely with slight
pressure of the finger (with the blade stopped).
8. Adjust blade-edge bearings so they just touch
the back edge of the blade (see Figure 18).
11.4 Test cutting to verify adjustment
accuracy
Test cuts can be used to determine whether or not
you have adjusted the blade accurately. Use 2-
inch round bar stock to perform these test cuts, as
follows:
1. With the bar stock securely clamped in the
vise, make a cut through the bar stock. (See
Figure 14.)
2. Mark the top of the bar stock.
3. Move the bar stock about 1/4-inch past the
blade so you can begin a second cut.
4. Rotate the bar stock 180 degrees so the mark
you made is now at the bottom of the cut.
5. Make a cut through the bar stock.
6. Use a micrometer to measure the thickness
variation of the disk you have cut from the bar
stock. Measure at the top and bottom of the
disk.
7. The saw blade can be considered correctly
adjusted when the variation measure is no
more than 0.012 inch across the face of the
disk.
8. If you do not have a piece of 2-inch bar stock
available for a test cut, use a larger diameter
test piece rather than a smaller one. The
maximum thickness variation on any test piece
should be no more than 0.003 inch, per side,
per inch of stock diameter.
Figure 14: Cutting a test disc
11.5 Limit switch adjustment
1. The limit switch is provided to shut off the saw
motor when the workpiece is cut through.
2. To set the limit switch, loosen the jam nut on
the limit switch stop (Figure 15).
3. Adjust the stop as required and retighten jam
nut.
Figure 15: Limit switch adjustment
12.0 Maintenance
12.1 Cleaning
1. Clean off any preservative on machine
surfaces.
2. After cleaning, coat the machined surfaces of
the cut-off saw with a medium consistency
machine oil. Repeat the oil coating process at
least every six months.